A high speed gradient mixer mill

Abstract

The application discloses a high-speed gradient stirring mill, which comprises a grinding cylinder, a feeding port, a discharging port, a mill air inlet, a mill air outlet, a stirring shaft, a stirrer, a driving device, a separating device and a cooling device; the stirrer is divided into a grinding stirrer and an activation stirrer, the grinding stirrer and the activation stirrer are arranged in a staggered and uniform manner along the stirring shaft, the grinding stirrer is fixed on the stirring shaft, the activation stirrer is installed on the stirring shaft through a coaxial differential transmission mechanism, the grinding stirrer and the activation stirrer rotate at different speeds under the action of the stirring shaft and the coaxial differential transmission mechanism, the diameter of the activation stirrer is smaller than that of the grinding stirrer, the separating device is a hollow hemispherical structure and is a hole-distance-adjustable separating device, and the size of the screen hole and the screening area can be adjusted and controlled. The application can improve the grinding efficiency of the dry stirring mill and the grinding effect near the shaft, flexibly control the fineness of the product discharged from the mill, and improve the reliability and stability of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stirring mill, in particular to a high-speed gradient stirring mill. BACKGROUND

[0002] The stirring mill is a kind of fine grinding equipment, which is widely used in the fields of mining, pigment, chemical industry, building material, medicine, etc. It is composed of a driving device, a cylinder, a stirring shaft, a stirrer and grinding media. The cylinder is usually a cylinder, the stirrer is usually a spiral type, a bar pin type and a disc type, and the grinding media are usually spherical media such as steel balls, corundum balls, zirconium balls or natural river sand and pebbles. During operation, the cylinder of the stirring mill is stationary, the driving device drives the stirring shaft to rotate the stirrer, the stirrer directly applies power to the grinding media, and the grinding media and the material make multi-dimensional circular motion and rotation motion to form a speed gradient in the cylinder, so as to realize effective grinding of the material through the extrusion force, a small amount of impact force, friction and shear force between the grinding media. The particle crushing is mainly based on friction crushing, and the extrusion force and impact force mainly affect the initial crushing effect of the particles, and the friction and shear force determine the fine grinding efficiency. Therefore, improving the friction and shear force between the grinding media can effectively improve the fine grinding efficiency. According to the grinding environment, the stirring mill can be divided into dry and wet methods, and according to the structure, the stirring mill can be divided into horizontal and vertical types.

[0003] At present, the wet stirring mill has been large-sized and widely applied, the existing dry stirring mill has a relatively small specification, and is in the stage of gradual popularization and application, and the following problems exist in the application.

[0004] (1) The existing dry stirring mill gradually decreases the linear speed from the edge to the center of the stirrer along the radial direction, so that the stirring effect of the stirrer on the grinding media and the material near the stirring shaft is insufficient, the movement degree of the grinding media near the stirring shaft is weak, the speed gradient is small, and the grinding effect is poor;

[0005] (2) The existing dry stirring mill has small friction and shear force between the grinding media, and low grinding efficiency;

[0006] (3) The existing dry stirring mill lacks effective control measures for the fineness of the ground material, the control of the fineness of the ground material is not flexible enough, and at the same time, the qualified products cannot be discharged in time, which leads to serious over-grinding of local material and reduces the stability of the equipment, thereby limiting the large-scale of the equipment;

[0007] (4) The existing dry stirring mill generates a large amount of heat during the grinding process, and has safety hazards such as high-temperature scalding and dust explosion, and lacks flexible and effective heat dissipation measures. SUMMARY

[0008] In order to solve the problems of low grinding efficiency, poor grinding effect near the shaft, poor reliability of the equipment, inflexible control of the fineness of the discharged material, and difficult heat dissipation of the equipment of the existing dry stirring mill, the application provides a high-speed gradient stirring mill, which can improve the grinding efficiency of the dry stirring mill and the grinding effect near the shaft, flexibly control the fineness of the discharged product, and improve the reliability and stability of the equipment.

[0009] The application is implemented as follows: a high-speed gradient stirring mill, which comprises a grinding cylinder, a feeding port, a discharge port, a mill air inlet, a mill air outlet, a stirring shaft, a stirrer, a driving device, a separation device, and a cooling device; the grinding cylinder is supported and fixed by a base and a support, the feeding port and the mill air inlet are arranged at one end of the grinding cylinder, the discharge port and the mill air outlet are arranged at the other end of the grinding cylinder, and the grinding cylinder is filled with grinding media; the stirrer is arranged on the stirring shaft near the feeding end in the grinding cylinder, and the separation device for separating the ground material and the grinding media is arranged on the stirring shaft near the discharge end; one end of the stirring shaft is connected with the driving device, the other end of the stirring shaft passes through the grinding cylinder along the axis of the grinding cylinder and is supported by bearings installed on the base and the support; and the cooling device is arranged on the periphery of the grinding cylinder.

[0010] The stirrer is divided into a grinding stirrer and an activation stirrer, the grinding stirrer and the activation stirrer are arranged in sequence and uniformly intersected along the stirring shaft, the grinding stirrer is fixed on the stirring shaft, and the activation stirrer is installed on the stirring shaft through a coaxial differential transmission mechanism, so that the activation stirrer rotates at a higher speed than the grinding stirrer under the action of the stirring shaft and the coaxial differential transmission mechanism; and the diameter of the activation stirrer is smaller than that of the grinding stirrer.

[0011] The separation device is a hollow hemispherical structure and is a hole-distance-adjustable separation device, so that the size of the screen hole and the screening area can be adjusted and controlled.

[0012] The driving device drives the stirring shaft to rotate, and the stirring shaft drives the grinding stirrer thereon to rotate in the same direction as the stirring shaft, and meanwhile, drives the coaxial differential transmission mechanism arranged on the stirring shaft to work, and further drives the activation stirrer to rotate at a higher speed than the grinding stirrer, so that the rotation of the grinding stirrer and the activation stirrer exerts a strong stirring action on the whole area of the cross section of the mill, so that the mill has a high speed gradient in the whole cross section. The material is fed into the grinding cylinder, and under the high-speed rotation stirring action of the grinding stirrer and the activation stirrer, the material and the grinding medium do multi-dimensional circular motion and rotation motion, and the material particles are broken by the grinding medium mainly in the form of friction and shear force. The air inlet of the mill is connected to cold air, and the material is gradually moved to the discharge end under the action of wind and stirring, and then the qualified particle size product is separated from the grinding medium through the adjustable separation device, the grinding medium is blocked by the separation device and remains in the grinding cylinder, and the ground material can be discharged through the separation device. The adjustable separation device can flexibly adjust the screen aperture, so as to adjust the grinding time of the material in the mill by adjusting the discharge speed, and flexibly adjust the fineness of the product discharged from the mill. The qualified product discharged from the separation device is discharged through the discharge port. The cold air introduced into the grinding cylinder is discharged through the air outlet above the discharge port after passing through the separation device. Cooling devices are arranged on the outer wall of the grinding cylinder to ensure continuous cooling under long-term operation of the equipment.

[0013] Preferably, the activation stirrer is of a disc type structure, and the activation stirrer is of a split type structure, and is divided into an activation fixed ring and an activation stirring ring from inside to outside along a radial direction, the activation fixed ring is installed on the hollow shaft of the coaxial differential transmission mechanism, the activation stirring ring and the activation fixed ring are fixed by bolt connection, a plurality of activation rods are uniformly arranged on two side surfaces of the activation stirring ring respectively, the activation rods are installed on the activation stirring ring by bolts, and the activation stirring ring is divided into two semicircular stirring blades.

[0014] Preferably, the diameter of the activation stirrer is 0.2-0.5 times the diameter of the grinding stirrer, and a plurality of through holes one are uniformly arranged on the disc surface of the activation stirrer in a circumferential direction, and the total area ratio of the through holes on the disc surface is 0.2-0.6.

[0015] Preferably, the coaxial differential mechanism is composed of a stirring shaft gear, a speed regulating gear one, a speed regulating gear two, a hollow shaft gear, a speed regulating gear shaft, a hollow shaft and a sealing cover, the stirring shaft gear is fixed on the stirring shaft, the speed regulating gear one and the speed regulating gear two are both fixedly installed on the speed regulating gear shaft, the two ends of the speed regulating gear shaft are rotatably installed on the sealing cover; the speed regulating gear one is engaged with the stirring shaft gear, the speed regulating gear two is engaged with the hollow shaft gear, the rotating speed ratio of the speed regulating gear one to the stirring shaft gear is greater than that of the speed regulating gear two to the hollow shaft gear; the hollow shaft gear is fixed on the hollow shaft, the two ends of the hollow shaft are coaxially installed on the stirring shaft through bearings respectively; the stirring shaft gear, the speed regulating gear one, the speed regulating gear two, the hollow shaft gear and the speed regulating gear shaft are all sealed in the sealing cover, the two ends of the sealing cover are connected with the stirring shaft and the hollow shaft through bearings respectively; the activation stirrer is fixed on the hollow shaft outside the sealing cover.

[0016] Preferably, the grinding stirrer is of a disc type structure, the distance between the outer edge of the grinding stirrer and the inner wall of the grinding cylinder is 2-10 times the diameter of the grinding medium; a plurality of through holes two are uniformly arranged on the disc surface of the grinding stirrer in the circumferential direction, and the total area ratio of the through holes on the disc surface is 0.2-0.6.

[0017] Preferably, the small-diameter end of the hole-distance-adjustable separation device is detachably fixed on the stirring shaft, and the large-diameter end forms a labyrinth seal with the grinding cylinder; the hole-distance-adjustable separation device is composed of an outer layer sieve plate and an inner layer sieve plate, the inner layer sieve plate is arranged inside the outer layer sieve plate and is attached to the outer layer sieve plate, the outer layer sieve plate is detachably installed on the stirring shaft and rotates with the shaft, and the inner layer sieve plate can rotate relative to the outer layer sieve plate; circular or long-strip-shaped sieve holes are arranged on the surfaces of the sieve plates, the opening positions and shapes of the sieve holes of the inner layer sieve plate and the outer layer sieve plate are consistent, and the diameters or widths of the sieve holes are 0.5-0.9 times the diameter of the grinding medium.

[0018] Further preferably, the large-diameter end edge of the outer layer sieve plate is provided with an annular sealing plate, the cross section of the annular sealing plate is "L" shaped, an annular sealing ring is arranged on the inner wall of the grinding cylinder, the annular sealing ring is provided with a U-shaped sealing groove, the annular sealing plate cooperates with the annular sealing ring to form a sealing area; the large-diameter end edge of the inner layer sieve plate is provided with a fastening ring, a plurality of arc-shaped long-strip-shaped through holes are uniformly arranged on the fastening ring in the circumferential direction, a plurality of fixed threaded columns for cooperating with the arc-shaped long-strip-shaped through holes are uniformly arranged on the annular sealing plate in the circumferential direction, the diameters of the fixed threaded columns are consistent with the widths of the arc-shaped long-strip-shaped through holes, the fixed threaded columns can move in the arc-shaped long-strip-shaped through holes, so that the inner layer sieve plate can rotate relative to the outer layer sieve plate, and the fixed threaded columns pass through the arc-shaped long-strip-shaped through holes and are fastened by nuts, so that the inner layer sieve plate and the outer layer sieve plate are fixed.

[0019] Preferably, the cooling device is a combined assembly cooling device, which is composed of a plurality of cooling units that can be interconnected; each cooling unit is made of flexible material with high thermal conductivity, which is rectangular when laid flat and can be bent arbitrarily, and one side of the cooling unit close to the cylinder of the grinding cylinder is attached with magnetic material that can be attached to the surface of the grinding cylinder, so that the cooling unit can be attached to the surface of the grinding cylinder under the action of magnetic force.

[0020] Further preferably, the cooling unit comprises a flexible shell, a sandwich layer for flowing of cooling medium is arranged in the middle of the flexible shell, and a plurality of heat dissipation fins are fixed to one side of the sandwich layer close to the cylinder of the grinding cylinder; a plurality of cooling medium inlet and outlet pipes are arranged at the edge of the flexible shell of each cooling unit, which can be connected through other cooling units or individually closed; a fixed clamping hole is arranged at the edge of each cooling unit, and the fixed clamping hole is connected and fixed with the fixed joint on the surface of the grinding cylinder. The cooling unit can be made in multiple sizes, so that it can be flexibly combined and laid on the outer wall of the grinding cylinder according to the area distribution and size of the outer wall of the grinding cylinder.

[0021] Preferably, the grinding cylinder is composed of a cylinder and end covers at both ends, and the ratio of the length to the diameter of the cylinder is 1.5-4. The grinding cylinder is horizontally arranged.

[0022] Preferably, the feeding port is arranged at the upper part of one side end cover of the grinding cylinder, and a wind locking feeding device is arranged at the feeding port, which makes the material enter the grinding cylinder at an angle of 45°-75° with the horizontal direction; the wind locking feeding device comprises a feeding device outer shell, a feeding device inner shell, a wind locking plate and a weight, the lower part of the feeding device inner shell extends into the feeding device outer shell, the wind locking plate is arranged in the feeding device outer shell and below the feeding device inner shell, the wind locking plate is fixedly connected with the weight and is installed on the feeding device outer shell through a rotating shaft, so that when there is no material passing through, the wind locking plate is attached to the bottom end surface of the feeding device inner shell under the action of the weight to block the feeding channel; when there is material passing through, the weight of the material makes the wind locking plate separate from the bottom end surface of the feeding device inner shell to open the feeding channel and make the material pass smoothly.

[0023] Preferably, the discharge port is arranged at the bottom of the grinding cylinder.

[0024] Preferably, the air inlet of the mill is arranged at the upper part of the grinding cylinder and is connected with the cylinder wall above the grinding cylinder, the direction of the air inlet is at an angle of 15°-45° with the horizontal direction, and air holes are uniformly arranged at the cylinder wall of the ventilation area of the grinding cylinder, and the diameter of the air holes is 0.1-0.9 times the diameter of the grinding medium.

[0025] Preferably, the air outlet of the mill is arranged at the upper part of the end cover on the discharge side of the grinding cylinder, the air outlet of the mill is horizontally arranged, and the downstream of the air outlet of the mill is connected with a dust collecting device.

[0026] Preferably, the driving device is arranged at one end of the feeding side of the grinding cylinder, and is driven by permanent magnet direct drive or motor plus speed reducer.

[0027] The present application has the following advantages and beneficial effects:

[0028] 1) The stirrer of the present application is divided into grinding stirrers and activation stirrers, which are arranged in sequence and cross coaxially, and under the action of the coaxial differential transmission mechanism, the activation stirrer has a smaller diameter and a higher rotating speed than the grinding stirrer, which provides a strong stirring action for the grinding medium and the material near the stirring shaft, and cooperates with the grinding stirrer to make the mill have a high speed gradient in the whole cross section, thereby improving the grinding effect of the whole mill.

[0029] 2) The coaxial differential transmission mechanism of the present application can transmit a higher rotating speed than the stirring shaft, so that the coaxial activation stirrer can rotate at a higher speed.

[0030] 3) The hole-pitch-adjustable separation device of the present application adopts a hollow hemispherical form, and compared with other forms of separation devices, has a larger material contact area and a larger screening area, which is beneficial to the discharge of qualified products; at the same time, the double-layer screen plate structure can adjust the size of the screen holes of the whole device by rotating the inner layer screen plate to block the screen holes of the outer layer screen plate by the solid area of the inner layer screen plate, so as to realize the flexible and adjustable effect of the overall screening area, thereby adjusting the discharge speed of the material, adjusting the residence time of the material in the mill, and controlling the product fineness.

[0031] 4) The combined assembly type cooling device of the present application is composed of a plurality of cooling units, a cladding layer for flowing of cooling medium is arranged in the cooling unit, the cooling unit is fast in heat dissipation and can be bent and attached to the surface of the cylinder, a single cooling unit can be made into multiple size specifications, and according to the area size of the outer wall of the cylinder, the combined assembly type cooling device can be flexibly combined and laid on the outer wall of the mill cylinder and interpenetrated to cool the cylinder as a whole. The combined assembly type cooling device is flexible in configuration, easy to maintain and replace, and at the same time, the problem of penetration of cooling medium into the equipment is avoided.

[0032] 5) The high-speed gradient stirring mill of the present application can improve the grinding efficiency of the dry stirring mill and the grinding effect near the shaft, flexibly control the product fineness, and improve the reliability and stability of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the drawings needed to be used in the specific embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are some specific embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0034] Figure 1 is a schematic diagram of the external structure of the high-speed gradient stirring mill provided by the embodiment of the present application;

[0035] Figure 2 is a schematic diagram of the internal structure of the high-speed gradient stirring mill provided by the embodiment of the present application;

[0036] Figure 3 is a schematic diagram of the structure of the wind-locking feeding device provided by the embodiment of the present application;

[0037] Figure 4 is a schematic diagram of the structure of the grinding stirrer provided by the embodiment of the present application;

[0038] Figure 5 is a schematic diagram of the structure of the activation stirrer provided by the embodiment of the present application;

[0039] Figure 6 is a schematic diagram of the structure of the coaxial differential transmission mechanism provided by the embodiment of the present application;

[0040] Figure 7 is a schematic diagram of the structure of the hole-distance-adjustable separation device provided by the embodiment of the present application;

[0041] Figure 8 is a schematic diagram of the cooling unit of the combined assembly type cooling device provided by the embodiment of the present application.

[0042] Fig. 1: 1, grinding cylinder; 2, air-lock feeding device; 2-1, outer shell of feeder; 2-2, inner shell of feeder; 2-3, air-lock plate; 2-4, rotating shaft; 2-5, weight; 3, discharge port; 4, driving device; 5, stirring shaft; 6, base and support; 7, air inlet of mill; 8, air outlet of mill; 9, combined assembly type cooling device; 9-1, flexible outer shell; 9-2, cooling fin; 9-3, pipeline for feeding and discharging cooling medium; 9-4, fixing clamping hole; 10, grinding stirrer; 11, coaxial differential transmission mechanism; 11-1, gear of stirring shaft; 11-2, speed regulating gear one; 11-3, speed regulating gear two; 11-4, gear of hollow shaft; 11-5, speed regulating gear shaft; 11-6, sealing cover; 11-7, hollow shaft; 12, activation stirrer; 12-1, activation fixing ring; 12-2, activation stirring ring; 12-3, activation rod; 13, adjustable separation device of hole distance; 13-1, outer layer sieve plate; 13-2, inner layer sieve plate; 13-3, annular sealing plate; 13-4, fixed threaded column; 13-5, fastening ring; 13-6, nut; 14, annular sealing ring. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0044] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0045] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] EMBODIMENT

[0047] Please refer to Figures 1-8The embodiment of the present application provides a high-speed gradient stirring mill, which comprises a grinding cylinder 1, a feeding port, a discharging port 3, a mill air inlet 7, a mill air outlet 8, a stirring shaft 5, a stirrer, a driving device 4, a separating device and a cooling device.

[0048] The grinding cylinder 1 is supported and fixed by a base and a support 6, one end of the grinding cylinder 1 is provided with the feeding port and the mill air inlet 7, the other end is provided with the discharging port 3 and the mill air outlet 8, the grinding cylinder 1 is filled with spherical grinding medium with a diameter of 2-10 mm, and the filling rate of the grinding medium is 50%-90%; the grinding cylinder 1 is composed of a cylinder and end covers at two ends, and the length-diameter ratio of the cylinder body is 1.5-4. The grinding cylinder 1 is horizontally arranged. In the embodiment, the length of the grinding cylinder 1 is 5000 mm, the diameter is 2500 mm, the grinding cylinder 1 is filled with spherical grinding medium with a diameter of 6 mm, and the medium filling rate is 80%.

[0049] The stirring shaft 5 close to the feeding end in the grinding cylinder 1 is provided with the stirrer, and the stirring shaft 5 close to the discharging end is provided with the separating device for separating the ground material from the grinding medium; the stirring shaft 5 is a high-speed shaft, one end of the stirring shaft 5 is connected with the driving device 4, the other end penetrates through the grinding cylinder 1 along the axis of the grinding cylinder 1 and is supported by the bearing installed on the base and the support 6.

[0050] The feeding port is arranged at the upper part of the end cover on one side of the grinding cylinder 1, and the feeding port is provided with the air-lock feeding device 2, the air-lock feeding device 2 makes the material enter the grinding cylinder 1 at an angle of 45-75 degrees with the horizontal direction; the air-lock feeding device 2 comprises a feeder outer shell 2-1, a feeder inner shell 2-2, an air-lock plate 2-3 and a weight 2-5, the lower part of the feeder inner shell 2-2 extends into the feeder outer shell 2-1, the air-lock plate 2-3 is arranged in the feeder outer shell 2-1 and below the feeder inner shell 2-2, the air-lock plate 2-3 is fixedly connected with the weight 2-5 and is installed on the feeder outer shell 2-1 through the rotating shaft 2-4, so that when there is no material passing through, the air-lock plate 2-3 is attached to the bottom end surface of the feeder inner shell 2-2 under the action of the weight 2-5, that is, the angle between the air-lock plate 2-3 and the horizontal direction is reduced, and the feeding channel is blocked; when there is material passing through, the weight of the material makes the air-lock plate 2-3 separate from the bottom end surface of the feeder inner shell 2-2, that is, the angle between the air-lock plate 2-3 and the horizontal direction is increased, the feeding channel is opened, and the material can pass through smoothly. In the embodiment, the material enters the grinding cylinder 1 at an angle of 65 degrees with the horizontal direction.

[0051] The discharging port 3 is arranged at the bottom of the cylinder body of the grinding cylinder 1, which facilitates the rapid removal of the separated material.

[0052] The air inlet 7 of the mill is arranged at the upper part of the grinding cylinder 1 and is connected with the cylinder wall above the grinding cylinder 1. The air inlet direction forms an angle of 15°-45° with the horizontal direction. The air holes are evenly arranged on the cylinder wall of the grinding cylinder 1 in the ventilation area. The diameter of the air hole is 0.1-0.9 times of the diameter of the grinding medium. In this embodiment, the air inlet direction forms an angle of 30° with the horizontal direction, and the diameter of the air hole is 2 mm. The air hole can uniformly supply air into the grinding cylinder 1 and avoid the interference of the grinding medium to the air duct.

[0053] The air outlet 8 of the mill is arranged at the upper part of the discharge side end cover of the grinding cylinder 1. The air outlet 8 of the mill is horizontally arranged. The downstream of the air outlet 8 of the mill is connected with the dust collecting equipment.

[0054] The driving device 4 is arranged at one end of the feeding side of the grinding cylinder 1. The driving device 4 adopts the driving mode of permanent magnet direct drive or motor plus speed reducer. In this embodiment, the driving mode of permanent magnet direct drive is preferably adopted.

[0055] The stirrer is divided into the grinding stirrer 10 and the activation stirrer 12. The grinding stirrer 10 and the activation stirrer 12 are evenly arranged along the stirring shaft 5 in sequence. The grinding stirrer 10 is fixed on the stirring shaft 5 and rotates with the stirring shaft 5. The activation stirrer 12 is installed on the stirring shaft 5 through the coaxial differential transmission mechanism 11. The grinding stirrer 10 and the activation stirrer 12 rotate at different speeds under the action of the stirring shaft 5 and the coaxial differential transmission mechanism 11. The diameter of the activation stirrer 12 is smaller than that of the grinding stirrer 10.

[0056] The coaxial differential mechanism 11 is composed of a stirring shaft gear 11-1, a speed regulating gear one 11-2, a speed regulating gear two 11-3, a hollow shaft gear 11-4, a speed regulating gear shaft 11-5, a hollow shaft 11-7 and a sealing cover 11-6. The stirring shaft gear 11-1 is fixed on the stirring shaft 5 and rotates with the stirring shaft 5. The speed regulating gear one 11-2 and the speed regulating gear two 11-3 are both fixedly installed on the speed regulating gear shaft 11-5, and the two ends of the speed regulating gear shaft 11-5 are rotatably installed on the sealing cover 11-6. The speed regulating gear one 11-2 is engaged with the stirring shaft gear 11-1, and the speed regulating gear two 11-3 is engaged with the hollow shaft gear 11-4. The rotating speed ratio of the speed regulating gear one 11-2 to the stirring shaft gear 11-1 is greater than the rotating speed ratio of the speed regulating gear two 11-3 to the hollow shaft gear 11-4. In this embodiment, the rotating speed ratio of the speed regulating gear one 11-2 to the stirring shaft gear 11-1 is 1.3 times of the rotating speed ratio of the speed regulating gear two 11-3 to the hollow shaft gear 11-4. The hollow shaft gear 11-4 is fixed on the hollow shaft 11-7, and the two ends of the hollow shaft 11-7 are coaxially installed on the stirring shaft 5 through bearings, so that the hollow shaft 11-7 does not rotate with the stirring shaft 5. The stirring shaft gear 11-1, the speed regulating gear one 11-2, the speed regulating gear two 11-3, the hollow shaft gear 11-4 and the speed regulating gear shaft 11-5 are all sealed in the sealing cover 11-6. The two ends of the sealing cover 11-6 are connected with the stirring shaft 5 and the hollow shaft 11-7 through bearings, and the sealing cover 11-6 does not rotate with the two shafts. The sealing cover 11-6 has a cylindrical structure. The activation stirrer 12 is fixed on the hollow shaft 11-7 outside the sealing cover 11-6. Under the action of the coaxial differential mechanism 11, the rotating speed of the hollow shaft 11-7 is higher than that of the stirring shaft 5, and thus the rotating speed of the activation stirrer 12 is higher than that of the grinding stirrer 10.

[0057] The stirring shaft 5 drives the speed regulating gear one 11-2 to rotate through the stirring shaft gear 11-1, and drives the speed regulating gear shaft 11-5 to rotate, and then drives the speed regulating gear two 11-3 on the speed regulating gear shaft 11-5 to rotate. The speed regulating gear two 11-3 drives the hollow shaft gear 11-4 to rotate, drives the hollow shaft 11-7 to rotate, and then drives the activation stirrer 12 to rotate. All the gears of the coaxial differential mechanism 11 are sealed in the cylindrical sealing cover 11-6, so as to protect the gears and ensure the stable operation of the gears.

[0058] The activation stirrer 12 is a disc type structure, the activation stirrer 12 is a split structure, and is divided into an activation fixed ring 12-1 and an activation stirring ring 12-2 from inside to outside in the radial direction, the activation fixed ring 12-1 is installed on the hollow shaft 11-7 of the coaxial differential mechanism 11, the activation stirring ring 12-2 and the activation fixed ring 12-1 are fixed by bolt connection, a plurality of activation rods 12-3 are uniformly arranged on the two side surfaces of the activation stirring ring 12-2 respectively, the activation rods 12-3 are installed on the activation stirring ring 12-2 by bolts, and the activation stirring ring 12-2 is divided into two semicircular stirring blades. In the embodiment, a bolt hole is arranged at the center of the activation rod 12-3, the activation rod 12-3, the stirring blade and the activation fixed ring 12-1 are fixed by bolts, the two semicircular stirring blades, the activation rod 12-3 and the activation fixed ring 12-1 are combined into a complete activation stirrer 12, and the activation stirrer 12 is easy to disassemble and maintain.

[0059] The diameter of the activation stirrer 12 is 0.2-0.5 times the diameter of the grinding stirrer 10, and a plurality of through holes one are uniformly arranged on the disc surface of the activation stirrer 12 in the circumferential direction, and the total area ratio of the through holes on the disc surface is 0.2-0.6. In the embodiment, the through holes one are arranged on the activation stirring ring 12-2, the diameter of the activation stirrer 12 is 500mm, and the through area on the disc surface is 0.06m 2 Each side surface of the activation stirring ring 12-2 is uniformly arranged with six activation rods 12-3.

[0060] The grinding stirrer 10 is a disc type structure, the distance between the outer edge of the grinding stirrer 10 and the inner wall of the grinding cylinder 1 is 2-10 times the diameter of the grinding medium, and a plurality of through holes two are uniformly arranged on the disc surface of the grinding stirrer 10 in the circumferential direction, and the total area ratio of the through holes on the disc surface is 0.2-0.6. In the embodiment, the distance between the grinding stirrer 10 and the inner wall of the grinding cylinder 1 is 20mm, that is, the diameter of the grinding stirrer 10 is 1960mm, and the through area on the disc surface of the grinding stirrer 10 is 1.2m 2 .

[0061] The separation device is a hollow hemispherical structure, the sieve plate is in a hollow hemispherical form, and compared with other forms, the contact area with the material is larger; and the separation device 13 is a hole distance adjustable type, so that the sieve hole size and the screening area can be adjusted and controlled.

[0062] The small end of the hole distance adjustable separation device 13 is detachably fixed on the stirring shaft 5, and the large end forms a labyrinth seal with the grinding cylinder 1 to prevent the grinding medium from passing through; the hole distance adjustable separation device 13 is composed of an outer layer sieve plate 13-1 and an inner layer sieve plate 13-2, the inner layer sieve plate 13-2 is placed inside the outer layer sieve plate 13-1 and is attached to the outer layer sieve plate 13-1, the outer layer sieve plate 13-1 is detachably installed on the stirring shaft 5 and rotates with the shaft, specifically, the outer layer sieve plate 13-1 has a small end with an annular support for fixing with the stirring shaft 5, and the fixing mode adopts a key groove, bolt or other detachable fixing mode. The inner layer sieve plate 13-2 can rotate relative to the outer layer sieve plate 13-1; each sieve plate surface is provided with circular or long strip-shaped sieve holes, the hole positions and shapes of the inner layer sieve plate 13-2 and the outer layer sieve plate 13-1 are consistent, and the diameter or width of the sieve holes is 0.5-0.9 times the diameter of the grinding medium. In this embodiment, long strip-shaped sieve holes are adopted, and the width of the sieve holes is 3 mm.

[0063] The large end edge of the outer layer sieve plate 13-1 is provided with an annular sealing plate 13-3, the cross section of the annular sealing plate 13-3 is "L" shaped, the inner wall of the grinding cylinder 1 is provided with an annular sealing ring 14, the annular sealing ring 14 is provided with a U-shaped sealing groove, the plate parallel to the axial direction in the annular sealing plate 13-3 cooperates with the annular sealing ring 14 to form a sealing area to prevent the grinding medium from passing through; the large end edge of the inner layer sieve plate 13-2 is provided with a fastening ring 13-5, a plurality of arc-shaped long strip-shaped through holes are uniformly provided on the fastening ring 13-5 along the circumferential direction, a plurality of fixing threaded columns 13-4 for cooperating with the arc-shaped long strip-shaped through holes are uniformly provided on the plate perpendicular to the axial direction in the annular sealing plate 13-3 along the circumferential direction, the diameter of the fixing threaded column 13-4 matches the width of the arc-shaped long strip-shaped through hole, the fixing threaded column 13-4 can move in the arc-shaped long strip-shaped through hole to enable the inner layer sieve plate 13-2 to rotate relative to the outer layer sieve plate 13-1, the fixing threaded column 13-4 passes through the arc-shaped long strip-shaped through hole and is fastened by a nut 13-6 to fix the inner layer sieve plate 13-2 and the outer layer sieve plate 13-1. During installation, the fixing threaded column 13-4 of the outer layer sieve plate 13-1 passes through the arc-shaped long strip-shaped through hole of the inner layer sieve plate 13-2 and is fastened by the nut 13-6. By adjusting the relative position of the fixing threaded column 13-4 and the arc-shaped long strip-shaped through hole, the inner layer sieve plate 13-2 can rotate relative to the outer layer sieve plate 13-1, and the solid area of the inner layer sieve plate 13-2 blocks the sieve holes of the outer layer sieve plate 13-1 to reduce the overall screening area.

[0064] The periphery of the grinding cylinder 1 is provided with a cooling device; the cooling device is a combined assembly cooling device 9, which is combined by a plurality of cooling units that can be communicated with each other; each cooling unit is made of flexible material with high thermal conductivity, which can be aluminum-based composite material. When laid, it is rectangular and can be arbitrarily bent, and the side close to the cylinder body of the grinding cylinder 1 is attached with magnetic material that can be attached to the surface of the cylinder body of the grinding cylinder 1, so that the cooling unit can be attached to the surface of the cylinder body of the grinding cylinder 1 under the action of magnetic force, and the heat conduction effect is guaranteed.

[0065] The cooling unit comprises a flexible shell 9-1, a sandwich layer for flowing of cooling medium is arranged in the middle of the flexible shell 9-1, a plurality of heat dissipation fins 9-2 are fixed on the side close to the cylinder body of the grinding cylinder 1 in the sandwich layer, and the heat dissipation area is increased; a plurality of cooling medium inlet and outlet pipes 9-3 are arranged at the edge of the flexible shell 9-1 of each cooling unit, which can be flexibly connected with other cooling units or individually closed; a fixed clamping hole 9-4 is arranged at the edge of each cooling unit, and the fixed clamping hole 9-4 is connected and fixed with the fixed joint on the surface of the cylinder body of the grinding cylinder 1. The cooling unit can be made into multiple size specifications, so that it can be flexibly combined and laid on the outer wall of the cylinder body of the grinding cylinder 1 according to the area distribution and size of the outer wall of the cylinder body of the grinding cylinder 1, and the grinding cylinder 1 is cooled as a whole. The combined assembly cooling device 9 is flexible in configuration, easy to maintain and replace, and the problem of penetration of cooling medium into the equipment is avoided.

[0066] The specific operation process of the stirring mill is as follows:

[0067] The driving device 4 drives the stirring shaft 5 to rotate, and the grinding stirrer 10 on the stirring shaft 5 rotates in the same direction with the stirring shaft 5, at the same time, the coaxial differential transmission mechanism 11 arranged on the stirring shaft 5 is driven to work, and the activation stirrer 12 is driven to rotate at a higher speed than the grinding stirrer 10, the rotation of the grinding stirrer 10 and the activation stirrer 12 exerts a strong stirring action in the whole area of the mill cross section, so that the mill has a high speed gradient in the whole cross section. The material is fed into the grinding cylinder 1 through the air-lock feeding device 2 above one end of the grinding cylinder 1, and does multi-dimensional circular motion and rotation motion under the high-speed rotation stirring action of the grinding stirrer 10 and the activation stirrer 12, and the material particles are broken by the grinding medium mainly in the form of friction and shear force. The mill air inlet 7 on the feeding end side is connected with cold air, and the material gradually moves to the discharging end under the action of wind and stirring, and then the qualified particle size product is separated from the grinding medium through the adjustable separation device 13, the grinding medium is blocked by the separation device and stays in the grinding cylinder 1, and the ground material can be discharged through the separation device, the adjustable separation device 13 can flexibly adjust the screening aperture, so as to adjust the grinding time of the material in the mill by adjusting the discharge speed, and flexibly adjust the fineness of the product discharged from the mill. The qualified product discharged from the separation device is discharged through the discharge port 3. The cold air in the grinding cylinder 1 is discharged through the air outlet above the discharge port 3 after passing through the separation device. The combined assembly type cooling device 9 is arranged on the outer wall of the grinding cylinder 1, so as to ensure the continuous cooling of the equipment under long-term operation.

[0068] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A high speed gradient stirred mill, comprising a grinding cylinder, a feed inlet, a discharge outlet, a mill air inlet, a mill air outlet, a stirring shaft, a stirrer, a driving device, a separating device and a cooling device; the grinding cylinder is supported and fixed by a base and a support, the feed inlet and the mill air inlet are arranged at one end of the grinding cylinder, the discharge outlet and the mill air outlet are arranged at the other end of the grinding cylinder, and the grinding cylinder is filled with grinding media; the stirrer is arranged on the stirring shaft close to the feed end in the grinding cylinder, and the separating device for separating the ground material from the grinding media is arranged on the stirring shaft close to the discharge end. The stirring shaft is connected with a driving device at one end and passes through the grinding cylinder along the axis of the grinding cylinder and is supported by bearings mounted on the base and the support; the periphery of the grinding cylinder is provided with a cooling device; characterized in that: The stirrer is divided into a grinding stirrer and an activation stirrer, the grinding stirrer and the activation stirrer are arranged in sequence along the stirring shaft, the grinding stirrer is fixed on the stirring shaft, and the activation stirrer is installed on the stirring shaft through a coaxial differential transmission mechanism, so that the grinding stirrer and the activation stirrer rotate at a higher speed under the action of the stirring shaft and the coaxial differential transmission mechanism; the diameter of the activation stirrer is smaller than that of the grinding stirrer; The separation device is a hollow hemispherical structure and is a hole distance adjustable type separation device, so that the size of the screen hole and the screening area can be adjusted; the small diameter end of the hole distance adjustable type separation device is detachably fixed on the stirring shaft, and the large diameter end forms a labyrinth seal with the grinding cylinder; the hole distance adjustable type separation device is composed of an outer screen plate and an inner screen plate, the inner screen plate is arranged inside the outer screen plate and is attached to the outer screen plate, the outer screen plate is detachably mounted on the stirring shaft and rotates with the stirring shaft, and the inner screen plate can rotate relative to the outer screen plate; each screen plate surface is provided with circular screen holes or long strip screen holes, and the opening positions and shapes of the inner screen plate and the outer screen plate are consistent; The large diameter end edge of the outer screen plate is provided with an annular sealing plate, the cross section of the annular sealing plate is "L" shaped, an annular sealing ring is arranged on the inner wall of the grinding cylinder, the annular sealing ring is provided with a U-shaped sealing groove, the annular sealing plate cooperates with the annular sealing ring to form a sealing area; the large diameter end edge of the inner screen plate is provided with a fastening ring, a plurality of arc long strip through holes are uniformly arranged on the fastening ring in the circumferential direction, a plurality of fixing threaded columns for cooperating with the arc long strip through holes are uniformly arranged on the annular sealing plate in the circumferential direction, the diameter of the fixing threaded column matches the width of the arc long strip through hole, the fixing threaded column can move in the arc long strip through hole to make the inner screen plate rotate relative to the outer screen plate, and the fixing threaded column passes through the arc long strip through hole and is fastened by a nut to fix the inner screen plate and the outer screen plate.

2. A high-speed gradient mixer mill according to claim 1, characterized in that The activation stirrer is a disc type structure, the activation stirrer is a split type structure, and is divided into an activation fixed ring and an activation stirring ring from inside to outside along the radial direction, the activation fixed ring is installed on the hollow shaft of the coaxial differential transmission mechanism, the activation stirring ring and the activation fixed ring are fixed by bolt connection, a plurality of activation rods are uniformly arranged on the two side surfaces of the activation stirring ring, the activation rods are installed on the activation stirring ring by bolts, and the activation stirring ring is divided into two semicircular stirring pieces.

3. The high-speed gradient mixer of claim 1, wherein, The diameter of the activation stirrer is 0.2-0.5 times the diameter of the grinding stirrer, and a plurality of through holes are uniformly arranged on the disc surface of the activation stirrer in the circumferential direction, and the total area ratio of the through holes on the disc surface is 0.2-0.

6.

4. The high-speed gradient mixer of claim 1, wherein, The coaxial differential mechanism is composed of a stirring shaft gear, a speed regulating gear one, a speed regulating gear two, a hollow shaft gear, a speed regulating gear shaft, a hollow shaft and a sealing cover.

5. The high-speed gradient mixer of claim 1, wherein, The grinding agitator is of a disc type structure, and the distance between the outer edge of the grinding agitator and the inner wall of the grinding cylinder is 2-10 times the diameter of the grinding medium.

6. The high-speed gradient mixer of claim 1, wherein, The diameter or width of the screen hole is 0.5-0.9 times the diameter of the grinding medium.

7. The high-speed gradient mixer of claim 1, wherein, The cooling device is a combined assembly type cooling device, which is composed of a plurality of cooling units connected with each other.

8. A high-speed gradient mixer as claimed in claim 7, characterised in that, The cooling unit comprises a flexible shell, a sandwich layer for flowing of cooling medium is arranged in the middle of the flexible shell, and a plurality of groups of cooling fins are fixed on the side of the sandwich layer close to the grinding cylinder body.

9. The high-speed gradient mixer of claim 1, wherein, The grinding cylinder is composed of a cylinder and end covers at two ends, the ratio of the length to the diameter of the cylinder body is 1.5-4, and the grinding cylinder is horizontally arranged.

10. The high-speed gradient mixer of claim 1, wherein, The feeding port is arranged on the upper portion of the end cover at one side of the grinding cylinder, and an air locking feeding device is arranged at the feeding port. The air locking feeding device enables the material to enter the grinding cylinder at an angle of 45-75 degrees with the horizontal direction. When the material passes, the weight of the material separates the lock plate from the bottom end surface of the feeder inner shell, opens the feeding channel, and allows the material to pass smoothly.

11. The high-speed gradient mixer of claim 1, wherein, The discharge port is arranged at the bottom of the grinding cylinder.

12. The high-speed gradient mixer of claim 1, wherein, The air inlet of the mill is arranged at the upper part of the grinding cylinder and connected with the upper cylinder wall of the grinding cylinder, the air inlet direction forms an angle of 15°-45° with the horizontal direction, the air holes are uniformly arranged on the grinding cylinder wall of the ventilation area, and the diameter of the air holes is 0.1-0.9 times the diameter of the grinding medium.

13. The high-speed gradient mixer of claim 1, wherein, The air outlet of the mill is arranged at the upper part of the discharge side end cover of the grinding cylinder, the air outlet of the mill is horizontally arranged, and the downstream of the air outlet of the mill is connected with the dust collecting equipment.

14. The high-speed gradient mixer of claim 1, wherein, The driving device is arranged at one end of the feeding side of the grinding cylinder and adopts a driving mode of permanent magnet direct drive or motor plus speed reducer.

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